I’ve been using Reef Crystals for years now and I like to have my alkalinity around the 8.6-8.8dKH. Ive been using the same batch I’ve had for roughly 1.5-2 years now and I am on my last mix of salt. My salinity is always at 1.025 and I’ve used brightwell aquatics, will never again use seachem vibrant sea, and I believe once I tried Red Sea Blue bag. Thinking of trying Red Sea again to see if I can get a bit more dKh consistency from the Red Sea where I feel Reef Crytals anytime I do a water change I’ll drop some dKH. I do also dose BRS 2-Part.